Apple’s iPhone X silicone case fits everywhere except the rear camera. It covers part of the camera housing (not the camera lens itself), & looks horrible and could risk your phone being more likely to come out of the case if dropped.

A cheap clear TPU iPhone X case from eBay fits my iPhone Xs really well. It has the same issue as the Apple silicone case but only barely, & only noticeable if you examine very closely. I’m satisfied with how it fits, except I need one that has a higher lip to keep the screen front touching table when set down for tempered glass screen protector.